/*
 * Copyright (C) 2008 Search Solution Corporation. All rights reserved by Search Solution. 
 *
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met: 
 *
 * - Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer. 
 *
 * - Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution. 
 *
 * - Neither the name of the <ORGANIZATION> nor the names of its contributors 
 *   may be used to endorse or promote products derived from this software without 
 *   specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE. 
 *
 */

package cubrid.jdbc.driver;

import java.io.*;

/**
 * Title: CUBRID JDBC Driver Description:
 * 
 * @version 2.0
 */

class CUBRIDInputStream extends InputStream
{
  private int position;
  private byte[] valueBuffer;

  CUBRIDInputStream(byte[] v)
  {
    valueBuffer = v;
    position = 0;
  }

  public synchronized int available() throws java.io.IOException
  {
    if (valueBuffer == null)
      return 0;
    return valueBuffer.length - position;
  }

  public synchronized int read() throws java.io.IOException
  {
    byte b[] = new byte[1];
    if (read(b, 0, 1) == -1)
      return -1;
    else
      return b[0];
  }

  public synchronized int read(byte[] b, int off, int len)
      throws java.io.IOException
  {
    if (b == null)
      throw new NullPointerException();
    else if (off < 0 || off > b.length || len < 0 || off + len > b.length
        || off + len < 0)
      throw new IndexOutOfBoundsException();
    else if (len == 0)
      return 0;

    if (valueBuffer == null)
      return -1;

    int i;
    for (i = position; i < len + position && i < valueBuffer.length; i++)
    {
      b[i - position + off] = valueBuffer[i];
    }

    int temp = position;
    position = i;
    if (position == valueBuffer.length)
      close();

    return i - temp;
  }

  public synchronized void close() throws java.io.IOException
  {
    valueBuffer = null;
  }
}
